The OB1
The OB1
The OB1
The OB1
The OB1
The OB1
The OB1
The OB1
The OB1
The OB1

The OB1

Regular price $3,299.00

DETAILS

 

A good fit is fundamental to building the perfect bike, yet it's one of the most overlooked aspects for many riders. Put simply, a bike that’s fit to your unique body and biomechanics will reduce risk of injury, improve comfort, power, and efficiency, and ultimately make you a faster, happier rider.

That's why we offer deep customization of fit and gearing for free on all of our bikes.

Want help building your perfect bike? Schedule a consult with one of our resident bike nerds to discuss fit, gearing, and spec.

 


 

 

Overview                  Specs                  Geometry                  FAQ


Our original legendary all-road gravel bike. With bombproof carbon wheels, crisp-shifting SRAM 1x drivetrains, powerful hydraulic brakes, and gearing options for every ride, the OB1 is equipped to tackle the steepest pitches you point it up (or down).

Professionally built-to-order with meticulously-curated components described by James Huang of CyclingTips as "a masterclass in OEM spec", the OB1 is a bespoke all-road joy machine that's made to last.

Chase down roadies, explore some new singletrack, or load up for a long adventure. Join the N=1 revolution.


Current lead time: Painted and built-to-order in just 4-6 weeks.
Weight: ~18.5 lbs (size M, standard seatpost)
Arrives 85% assembled (see prep guide)


Why you'll love the OB1

  • Endurance road geometry for all day comfort and balanced handling.
  • Bombproof carbon wheels built for speed, strength, and durability at a race-ready weight. Choose between 650Bs and 700Cs, or swap 'em in 90 seconds.
  • Tailored fit with customizable choice of stem length, bar width, and crank length.
  • Optional integrated dropper post puts you in control when the going gets rough.

Gearing for every adventure

  • Wide-range 1x drivetrains for crisp simple shifting with no cross-chaining, chain slap, or chain drop, and a cage-lock feature on the derailleur for swapping between wheelsets.
  • Rider-specific gearing with your choice of chainring and cassette for both 650B and 700C wheelsets, allowing optimal low end gearing for steep dirt and top end gearing to keep pace with the pack on road rides.
  • Hollow-forged cranks offer incredible stiffness and durability.

Obsessive on the details

  • A creak-free bottom bracket with oversized Japanese stainless steel bearings and a 2-piece aluminum shell that threads together for perfect alignment.
  • Tubeless done right with high-volume tires matched to wide rims for easy set-up, fewer flats, greater efficiency, and an extra smooth ride.
  • Shock-absorbing bar tape and a remarkably comfortable saddle for all day riding.
  • Mounting points galore for bags, extra bottles, fenders, bento, and any other gear you need for your all-day (or all-month) adventure.


 

Specs

Chassis    |    Cockpit    |    Drivetrain & Braking    |    Wheels


Click on the name of each component to learn more about why we chose it.  Every detail, down to the bolts and bearings, is selected for the optimal balance of performance, durability, and serviceability.

To learn more about our approach, check out how we built a high-end carbon dream bike.

CHASSIS

DETAILS
  • Spirited yet stable endurance road geometry
  • Clearance for 650B x 47mm or 700C x 40mm
  • Mounting points for (5) cages, fenders, a bento, and more
  • Up to 46T or 50/34T chainrings
  • Round 27.2 seat tube with traditional seat post clamp
  • Construction: Reinforced Toray 800/700
  • 1145g +/-5% (medium black w/o hardware)
WHY WE CHOSE IT
From road to gravel to travel, our OB1 frameset is ready for every road. Its sleek road-bike design hides clearance for wide dirt tires and discreet mounting points for bags, fenders, extra bottles, and everything else you may need along the ride. From reinforcement at every hole and boss, to anti-corrosive fiberglass where carbon meets metal, to bolt-secured aluminum cable guides, we've invested in the details to deliver you performance without compromise.
DETAILS
  • Accommodations for fenders, headlight, and cages
  • Clearance for 650B x 47mm and 700C x 40mm tires
  • Steersafe-reinforced carbon steerer
  • 12x100mm thru-axle dropouts
  • Reinforced Toray 800/700 carbon construction
  • 445g fork | 45g SteerSafe
WHY WE CHOSE IT
We created SteerSafe to ensure your carbon steerer is fully supported against stem clamping forces. SteerSafe is an aluminum tube with built-in starnut that gets bonded into our carbon steerers at the factory. To shorten a SteerSafe equipped steerer, simply cut through the carbon and aluminum layers using a guide and a carbon-specific blade as you would a normal carbon steerer, then use ultra-fine sandpaper to create a smooth, slightly rounded edge. Finish by torquing the lubricated stem bolts to 5 Nm.

Note that we pre-cut our steerers to an exposed length of ~69mm, then bond in our SteerSafe insert from there. We do this to prevent folks from using a tall stack of spacers below a downward-pointed stem, as this can lead to imprecise steering. Those needing a more upright position should start be flipping the stem. Should this prove insufficient despite the OB1s relatively tall head tube, we recommend sourcing a 17 degree stem in order to maintain steering precision.
DETAILS
  • Hollow bolt-on
  • 6mm hex head
  • Strong and durable 7075 alloy
  • Just ~80g per set
WHY WE CHOSE IT
Our hollow bolt-on thru-axles are machined from ultra-premium 7075 aluminum for strength, durability, and ease of wheel removal at less than half the weight of levered designs.
DETAILS
  • Integrated look
  • Traditional clamping interface for even distribution of forces
WHY WE CHOSE IT
OB1's seat clamp achieves its integrated look while utilizing a traditional clamping interface that, unlike proprietary integrated designs, evenly distributes clamping forces to avoid seatpost creaking, slipping, or cracking. 
DETAILS
  • Stainless steel cartridge bearings
  • Sealed upper cap
  • Split crown race
  • Upper: 41.8x30.5x8 | 45°x45°
  • Lower: 51.9x40x8 | 45°x45°
WHY WE CHOSE IT
Designed for durability, our lightweight integrated headset features premium stainless steel bearings to prevent corrosion in wet and muddy conditions. The sealed top cap provides an extra barrier to water penetration and its replaceable aluminum split crown race protects the carbon steerer crown from wear while being less prone to creaking than non-split races.
DETAILS
  • Rigid for use with long-cage derailleurs
  • Axle threads directly into the hanger
  • Extra included just in case
WHY WE CHOSE IT
Flexy derailleur hangers compromise shifting and are quick to fail. The OB1's is stiff and strong to withstand the greater loads placed on it by today's long-cage derailleurs and wide range cassettes, but will still sacrifice itself to protect the derailleur and frame in the event of a major impact. And don't worry - we include an extra just in case.
Mounting points for all your gear:
  • 2 bottle mounts in the front triangle
  • 1 bottle mount below the downtube
  • 1 bento mount on the top tube
  • 2 bottle mounts on the fork blades
  • Front and rear fender mounts (seat stay bridge included)
  • Wide central clamping area on handlebar
Note: For optimum performance, load your heaviest items in a frame bag secured in the main triangle.
Max weight of rider + gear: 125kg (275lbs)

 

COCKPIT

DETAILS
  • 1-piece 3D-forged 2014-T6 alloy construction
  • Easily adjustable, exceptionally secure 2-bolt clamp
  • Reversible head
  • 0° offset to match the frame's 73° seat tube angle
  • Reversible lower clamp
  • 230g (400mm) | 210g (350mm)
WHY WE CHOSE IT
OB1's seatpost weighs less than some carbon posts yet is safe to use with clamp-on accessories like bikepacking seat bags. Its quill is forged from a single billet of ultra-premium 2014-T6 aluminum for outstanding strength to weight. The 2-bolt clamp offers superior saddle adjustability, security, and support, while the supportive lower clamp plate is reversible to allow an extreme range of fore/aft positioning.
DETAILS
  • Infinitely adjustable
  • Lightweight 1-piece forged head and quill
  • Easy to adjust 2-bolt clamp with reversible head
  • Premium 7075-T651 aluminum construction
  • Clean internally-routed design
  • Serviceable with readily available parts
  • Tests to an ISO MTB standard
  • Actuated by front shifter
  • 405L|110mm (485g), 360L|90mm (460g), 310L|70mm (425g)
WHY WE CHOSE IT
A dropper post is an absolute game-changer. Dropping the saddle out of the way allows you to shift your center of mass down and back over the rear wheel, keeping your front end light, allowing you to use your rear brake for speed control, and freeing your legs to act as suspension. The result is increased control, speed, and confidence over steep or technical terrain. They're even great for fast road descents. We've been riding droppers on our drop-bar bikes since before it was cool, so whether you're looking to get shreddy off-road or just want to feel safer on that high speed road sweeper, a dropper is an option well worth considering.

The 2-bolt clamp offers superior saddle adjustability, security, and support, while the supportive lower clamp plate is reversible to allow an extreme range of fore/aft positioning.

Check out the "Why Gravel Posts are an absolute game-changer" tech segment we produced with The Gravel Ride Podcast to learn more about why you'll want a dropper on your next bike.
DETAILS
  • 116mm drop | 75mm reach | 10 ° flare
  • Comfy aero flat top
  • Wide central clamping area for accessories
  • Double butted alloy
WHY WE CHOSE IT
Aero on the tops, control and comfort in the drops. With a short reach, shallow drop, and subtle 10° of flare, our handlebar keeps you comfy when motoring on the hoods while offering greater leverage when cornering, descending, or shredding dirt in the drops, all while reducing back and wrist strain. Its wide central clamping area allows you to attach a bell, GPS, bar bag, aero clip-ons, or all 4 at once if that's what your adventure requires.
DETAILS
  • 3D-forged 7050 aluminum
  • 7° angle
  • Exceeds ISO Road and MTB standards
  • 105g (100mm)
WHY WE CHOSE IT
A top-of-the-line stem equivalent to others retailing at $100+, our 7050-series alloy stem is stronger, stiffer, and lighter than others' $250+ carbon offerings.
DETAILS
  • 148 width
  • 244 length
  • Wide, supportive nose
  • Pressure relieving padding and cutout
  • Hollow Cr-Mo rails 260g
  • Carbon Fiber rails 205g (+$50)
WHY WE CHOSE IT
Wide, short, cut-out saddles like ours first gained popularity among triathletes and time-trialists looking for improved comfort over long stints in extremely aggressive positions. Eventually roadies and mountain bikers discovered their benefits and brought them into their disciplines as well. With a bit more cushion for mixed terrain riding and hollow Cr-Mo rails for outstanding strength (or carbon fiber rails for a slightly lighter package), this is a saddle meant for long days on rough roads. Our riders love these saddles so much that many have outfitted their entire stable with them.

 

DRIVETRAIN & BRAKING

Mechanical 1x11

DETAILS
  • Powerful full-hydraulic braking
  • Slick mechanical shifting
  • Adjustable reach for small hands
  • Dropper-ready left lever
WHY WE CHOSE IT
SRAM uses the same internals across all its road lines to achieve identical pro-level shifting and braking performance. Only 42 grams separates Rival from the pricier Force version with its carbon levers, and we invested those funds in high-end carbon wheels, lightweight cockpit components and other upgrades that improve performance while saving vastly more weight.
DETAILS
  • Clutch prevents chain slap and droppage
  • Cage-lock makes it easy to swap wheels
  • Long cage accommodates cassettes up to 46T
  • Cartridge-bearing pulleys
  • 271g
WHY WE CHOSE IT
Completely identical to Force 1 except for its aluminum vs. carbon front cage plate (~4g), SRAM's Rival 1x11 rear derailleur features worthwhile upgrades over Apex 1 that include superior construction quality, more durable cartridge bearing pulleys, and a 50g+ lighter weight. It's clutched main pivot prevents chain slap and droppage when charging through rough terrain, and its clever cage-lock feature makes swapping between wheelsets a breeze.
SunRace Ultra Wide Range
DETAILS
  • 11-42T offers a wide 382% range with smaller jumps
  • 11-46T offers an even wider 418% range with more low-end
  • 404g +/-5% (11-42T) | 465g +/-5% (11-46T)

WHY WE CHOSE IT
Slick-shifting, and durable, we've been rocking 1x11 drivetrains using these premium SunRace cassettes for years to great effect. With proper chain maintenance, you'll enjoy many thousands of miles of trouble-free use before needing a replacement.


e*thirteen TRS Plus & XCX Plus
DETAILS
  • 9-39T offers 433% of range that is perfect for road riding.
  • 9-42T offers an even wider 467% range that is plenty for steep road and dirt riding.
  • 9-46T offers a massive 511% range that you'll appreciate on steep dirt climbs
  • 315g +/-5% (9-39T) | 330g +/-5% (9-42T) | 395g +/-5% (9-46T)
WHY WE CHOSE IT
Massive range with minimal weight makes the e*thirteen's TRS Plus cassettes an excellent choice for a number of use cases. The 9-39T offers substantial range and smaller jumps between gears, with a 9T overdrive gear to give you a road-bike top end that you want spin out. The 9-46T has even greater range than our AXS 1x Eagle build kit, while remaining relatively trim, making it well suited to carrying a load while bikepacking when paired with a smaller chainring. e*thirteen's 9-42T is the Goldilocks of gravel gearing: just right.
DETAILS
  • Up to 124 links (depending on gearing)
  • Quick-Link master-link
  • 259g
WHY WE CHOSE IT
This chain gets the job done with neither fanfare nor fuss. Designed by SRAM to work with all their 1x11 drivetrains, the workhorse PC1110 shifts and wears as well as far more expensive models. Keep it clean, treat it regularly with a wax-based lube, and replace it the moment your checking tool (you do have one, right?) indicates elongation in order to keep your drivetrain quiet, your shifts snappy, and chainrings and cassettes free of premature wear.

Electronic 1x12

DETAILS
  • Wireless 1x12 electronic shifting
  • Powerful full-hydraulic braking
  • Reach adjust to fit hands of all sizes
  • Brake bad contact point adjustment
  • Port on each lever for "Blips"
  • 750g (both levers with calipers, batteries, and hoses)
WHY WE CHOSE IT
SRAM's Force AXS levers take the excellent shifting and braking we've come to love from SRAM's mechanical levers and add the light-touch of wireless electronic shifting, an extra gear, and contact point adjustment to dial how the brake pads bite. They are also identical to the top-of-the-line Red AXS save for a ~15g difference in lever weight. If you have the budget and simply must have electronic, SRAM Force AXS is the way to go.
DETAILS
  • Wireless electronic actuation
  • Cage-lock feature for easy wheel swaps
  • Roller bearing clutch eliminates derailleur bounce and chain slap
  • 388g with battery
  • Includes AXS single-port battery charger
WHY WE CHOSE IT
Identical in all but finish to their top-end XX1 AXS offering, SRAM's X01 AXS 1x12 electronic rear derailleur offers the same slick shifting as their Rival 11-speed mechanical model in a wireless electronic 1x12 electronic format.
SRAM Eagle XG-1275
DETAILS
  • 520% range
  • XD freehub-compatible
  • 450g
WHY WE CHOSE IT
SRAM's XG-1275 offers expanded range at a reasonable pricepoint. Sporting 12 speeds and 520% range, you'll always have the right gear for your fitness and terrain.



SRAM Eagle XG-1295
DETAILS
  • Beautifully machined stainless steel with alloy 50t cog
  • Huge 500% range
  • 10-50T: 10, 12, 14, 16, 18, 21, 24, 28, 32, 36, 42, 50
  • 355g
WHY WE CHOSE IT
SRAM's XG-1295 cassette is a masterpiece of CNC-milled steel and aluminum. It also happens to be identical in all but finish to their top-of-the-line XG-1299.
DETAILS
  • Chrome hardened pins
  • Anti-friction and anti-corrosion finishes
  • Includes quick link
  • 266g (124 links)
WHY WE CHOSE IT
Chains are a wear item that should be checked, cleaned, lubed, and replaced frequently for optimal performance and to preserve your expensive chainrings, cassettes, and derailleur pulleys. Within SRAM's line, we chose the GX 12-speed chain for its hardened steels and anti-friction/anti-corrosion finishes.
DETAILS
Thesis Hollow-Forged Alloy
  • Hollow-forged 6061 alloy arms
  • Machined 7075 alloy BB386EVO spindle
  • Machined 7075 alloy narrow-wide chainring (6mm offset)
  • Open-standard 3-bolt DM chainring interface 
  • Compatible with 4iiii single-sided power meters
  • 625g crank (172.5), 99g chainring (42T)
WHY WE CHOSE IT
Strong, Stiff, Light: Pick 3. How do you create a crank that achieves extraordinary stiffness-to-weight in an easily serviceable package that isn't afraid of a rock strike? Take two billets of ultra premium 7075 aluminum. Smash each under 600 tones of force to form two hollow, box-section arms. Then take another billet of that same alloy and machine it into a large diameter BB386 spindle to push the bottom bracket's oversized bearings as far apart as possible for even more stiffness and durability. Sandblast rather than polish all surfaces to pound-out microfractures, and anodize everything for an even harder and longer-wearing finish.
DETAILS
SRAM Force 1 Carbon
  • Lightweight carbon arms
  • DUB-standard 29mm spindle
  • Compatible with SRAM dual and 4iiii single-sided power meters
WHY WE CHOSE IT
SRAM's Force 1 AXS carbon crankset offers ~100g of weight savings and is compatible with their spider-based dual-sided power meter. SRAM does not offer lengths below 165mm, so riders should select our Thesis Hollow-Forged cranks to ensure proportional crank length.



DETAILS
SRAM Centerline 160mm
  • Stainless steel with alloy spider
  • 160mm front and rear
  • Centerlock
  • 161g
    WHY WE CHOSE IT
    SRAM's Centerline 160mm rotors offer a blend of power, modulation, smooth operation, and heat-management. We chose Centerlock over a 6-bolt interface easier installation or removal when traveling.

    DETAILS
    • Precision-milled, thread-together aluminum shell
    • Premium NSK Japan 6806 stainless steel sealed cartridge bearings
    • Open standard BB386EVO interfaces
    • 29mm spindle adaptors used with SRAM cranks
    • 145g
    WHY WE CHOSE IT
    Our thread-together aluminum BB shell is strong and stiff to ensure perfect alignment and support our widely-spaced, large-ball cartridge bearings. It's the same $70+ solution that mechanics turn to when cheap press fit bottom brackets creak and fail. It adds a handful of grams and quite a bit of cost, and we think the increased durability, efficiency-under-load, and general peace of mind are well worth the investment.


    Want to use your own drivetrain? Check out our Bring Your Own Drivetrain option.

     

    WHEELS

    Thesis RCG 700C

    DETAILS
    • RCG44 = Road Cyclocross Gravel 44mm depth
    • 22mm internal | 30mm external
    • Asymmetric U/V aero profile
    • Aero-optimized for 28/30mm tires
    • Wide enough to support 40mm+ tires
    • Tubeless-ready mid-hook design (compatible with tubes)
    • Angle drilling & reinforced nipple seat for durability
    • Toray 800/700 blend
    • 30 - 90psi
    • 430g
    WHY WE CHOSE IT
    An versatile performer that's aero-optimized for 28-30mm slicks yet wide enough to support 40mm+ knobbies, our RCG44 700C carbon rims let you take advantage of the improved rolling resistance and comfort of today's more voluminous tubeless performance tires without sacrificing aerodynamics. They feature  2.5mm of asymmetry, angled spoke hole drilling, and a reinforced nipple seat for high and balanced spoke tensions, which in turn create a stiffer, stronger, and more durable wheelset.  Their tubeless mid-hook design improves impact strength and tire stability at low pressures. With a bias toward speed, these rims are ideal for road, cyclocross, gravel, commuting, and speed touring.
    DETAILS
    - 700c x 30mm
    - Supple tubeless-ready casing
    - Slick dual compound tread for efficiency, durability, and grip
    - 335g
    WHY WE CHOSE IT
    A fast-rolling road slick that isn't afraid of the dirt, WTB's Exposure 30 Road tires employ a supple tubeless-ready casing and a dual-compound tread to offer a great balance of rolling speed and off-pavement capability. Matched to our Aero-Wide Carbon 700C tubeless rims, they're equally suited to all day epics and the the local hammerfest. Run them at 55-90psi depending on weight for optimal performance.

    Thesis GT27 650B

    DETAILS
    • GT27 = Gravel Trail 27mm internal width
    • 33mm external | 24.5mm deep
    • Optimized for 47mm+ tires
    • Tubeless-ready hookless design, also compatible with standard tubed tires
    • 3mm offset, angle drilling, & reinforced nipple seat
    • Toray 700/800 construction
    • 370g
    WHY WE CHOSE IT
    An adventure-lover that's optimized to support popular 47mm gravel tires at low pressures, our GT27 650B rims' wide internal profile enhances tire volume for compliance, traction, and stability in the dirt. They feature 3mm of asymmetry, angled spoke hole drilling, and a reinforced nipple seat for high and balanced spoke tensions, which in turn creates a stiffer, stronger, and more durable wheelset.  Their hookless design improves impact strength and tire stability at low pressures. With a bias toward comfort and traction, these rims are great for technical gravel, bike-packing, speed commuting, and speed touring.

     

    DETAILS
    • Sits a generous 49mm on our wide 650B rims
    • Supple yet robust casings
    • Tubeless
    • 555g
    WHY WE CHOSE IT
    The WTB Venture is the perfect all-arounder, with a file tread center for rolling efficiency on tarmac and pronounced side knobs for cornering grip in the dirt. Its supple casing and tubeless compatibility give it a smooth ride that holds up in the most challenging conditions. They inflate to around 49mm on our ultra-wide 650B rims and are best at 20-40psi (max) depending on your weight and terrain.
    DETAILS
    • Bombproof 18T Star Ratchet engagement system
    • (4) 6902 sealed cartridge bearings
    • Centerlock rotor interfaces
    • 12 x 142mm thru-axle
    • 267g
    WHY WE CHOSE IT
    Rear hubs are notoriously prone to failure due to the extreme loads and environmental stresses they experience. That's why we invested in DT Swiss' rightfully venerated DT350 rear hub. It features the famously strong and durable Star Ratchet engagement system, large 6902 sealed cartridge bearings, tool-less serviceability and convertibility to other axle or freehub standards, and a centerlock interface for easy rotor installation and removal.

    The DT350 hub is 2.5x stronger, 5x more durable, and 3-5x more expensive than the pawl-based models most brands employ to reduce cost. Whether you're ripping it up on singletrack, touring through a remote wilderness, or simply putting in long miles year after year, these are the hubs you'll want to trust to keep you going.

    You can learn more about DT's Star Ratchet engagement system here.
    DETAILS
    • (2) premium 6802 sealed cartridge bearings
    • Centerlock rotor interface
    • 28h J-bend flanges
    • 12 x 100mm thru-axle
    • 136g +/- 5%
    WHY WE CHOSE IT
    DT350 hubs are renowned for their durability, serviceability, and adaptability. They achieve their light weight without resorting to durability-compromising tricks. What do we mean? Just as there are brands that will use failure-prone aluminum nipples to shave grams, there are others who may spec a hub with tiny bearings and a narrow hub shell to achieve an eye-catching weight. However, those small bearings wear out fast, and that narrow shell may not withstand the torsional loads associated with disc brakes.
    DETAILS
    • Cold forged
    • Aero bladed
    • Sandvik T302+ stainless steel
    • Single length
    • 4.3g each
    WHY WE CHOSE IT
    Why invest so much on so many fancy wing-shaped spokes? Because the same cold-forging process that turns a length of round straight-gauge wire into a light and aero wing spoke also improves strength-to-weight and elastication by realigning the grain flow of the metal and reducing its cross-sectional area. The result is a spoke that can be run at high tension while experiencing less change in tension and thus fatigue with each wheel rotation or impact. Furthermore, unlike cheaper round "butted" spokes that are in fact cold-forged in a similar process, wing,-shaped spokes can be tensioned without inducing spoke wind-up, further extending the life of the wheel.

    Our rims are asymmetrical, allowing us to balance spoke tensions for even more durability and stiffness while also allowing a single length of spoke to be used throughout the entire wheelset for ease of repair.
    DETAILS
    • Durable brass
    • Resists seizing, splitting, & other failure modes
    • Can be trued with tires and rim-tape in place
    • 1g each
    WHY WE CHOSE IT
    Why do mechanics love externally-adjustable brass nipples? Aluminum nipples are a trick used by some brands achieve attention-grabbing weights at the expense of durability and serviceability. Aluminum oxidizes and is much softer than brass, making aluminum nipples notoriously prone to seizure, splitting, and failure. The result is that a simple wheel true can turn into a costly rebuild with new nipples and spokes. Weight savings? Less than 18 grams per wheel.

    As for the hidden nipples used by some brands, no one envies having to remove your tires, sealant, rim tape, and valve stems just to perform necessary maintenance. Aerodynamic advantage? Zero. Zilch. Nada.
    DETAILS
    • Each wheel is built by a single, skilled professional
    • 2-cross lacing for lateral and rotational strength
    • 28 spokes for durability and stiffness
    WHY WE CHOSE IT
    Strong, durable wheels require more than the best components. That's why we invested having our wheels professionally hand-built and machine checked. With a professional touch-up at 1200 miles and regular check-ups for tension and true, our wheels will continue to perform year after year.

     

    Have a question? Check out our FAQ or reach out to us directly at support@thesis.bike to talk to a real human. We're always happy to talk bikes.
     

    Shop now

     


     

    Geometry

     



    Frame Size XS S M L XL
    Typical Height Range
    5'1" - 5'5" 5'4" - 5'8" 5'6" - 5'11" 5'10" - 6'2" 6'1" - 6'5"
    A Reach 356 363 378 388 403
    B Stack 521 551 571 595 614
    C Head Tube 110 138 155 180 200
    D Effective Top Tube 515 531 547 570 591
    E Wheelbase 987 995 1007 1025 1046
    F Front-Center 578 586 598 616 637
    G Head Tube Angle 70° 71° 72° 72° 72°
    H Fork Offset 51
    I Fork Axle to Crown 385
    J BB Drop 73
    K Chain Stay 420
    L Seat Tube Angle 73°
    M Seat Tube 440 470 500 530 560
    Standover (Midpoint of TT) 720 750 775 805 835
    Default Handlebar (C-C)
    380
    400 420 420 440
    Default Stem (7°) 70 80 90 100 110
    Default Crankarms 155 160 165 170 175
    Default Seatpost 350 350 400 400 400
    Dropper Seatpost
    Default Length | Travel 315 | 70 360 | 90 360 | 90 405 | 110 405 | 110
    Default Saddle Height Range 610 - 660 660 - 735 690 - 750 735 - 820 765 - 850
    Alternate Length | Travel 360 | 90 315 | 70 405 | 110 360 | 90 360 | 90
    Alternate Saddle Height Range 650 - 705 640 - 690 705 - 790 720 - 795 750 - 825


    All figures in millimeters unless otherwise indicated.

     

     


     

    What they're saying about the OB1

    "I've been playing bikes for over twenty years now. This bike inspires a mix of speed, fun and confidence I've never felt before. I had high expectations for this bike, and I’m happy to say it has blown me away." - Rachel C.

    “I've been loving my OB1. It's opened up a whole other world of riding for me with many new places to explore. Every time I'm on a new trail, I'm blown away by the beauty of the new places I'm discovering, excited to go out and try a route I've never done before and very thankful I have the OB1 to take me to all these places I previously couldn't go to before.” - Andy W.